JPH02303805A - Equipment for mixing building material - Google Patents

Abstract

PURPOSE:To achieve excellent mixing even when the mixing time is short by forming an element for bonding the mixing blades from a connecting supporter aiding the mixing stage. CONSTITUTION:The rotary holding arms 5, 6 rotated in the front parts of the end face sides 3, 4 of a mixing vessel 2 are mutually dislocated at 180 deg. and extended in the radial direction. the arms 5, 6 holds spirally curved mixing blades 7, 8. The mixing blades are extended beyond the central part at a 30 deg. attack angle in the mixing vessel 2. A connecting supporter 10 has a shape of a projection curved in the cross section and the central face thereof is slantingly provided between the free ends of the mixing blades 7, 8 at the prescribed attack angle alpha for the axial line of the mixing vessel 2. Kneading of a material to be mixed is favorably performed in the axial direction because the central face of the connecting supporter is slantingly provided.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a device for mixing building materials according to the preamble of claim 1 of the patent claims.

The subject of the invention according to German Patent Publication No. 23 366 699 relates to a mixer of the above-mentioned type.

In this mixer, the mixing blades move freely within the mixing vessel, in which case the substances to be mixed are homogenized. The mixing vanes are connected to a carrier arm, which is rotated via a shaft driven by a motor and forced to be synchronized in order to avoid undesirable interactions between the mixing vanes. Subject to the (bending) moments acting on the mixing vane, the shaft must be relatively stable and, in particular, must be relatively long, so that corresponding bearings must be provided; The side walls of the mixing vessel must likewise be dimensioned accordingly. Furthermore, the forced synchronization described above means that a large amount of expenditure is required for the entire drive mechanism.

From French Patent Publication No. 23 56 490, a mixing and conveying device associated with a concrete injection unit is already known, in which a number of helical mixing elements protrude into the mixer or It passes through the mixer. The mixing screws are rigidly connected to each other at their free ends via disc-shaped retaining plates. This holding plate divides the mixing drum into a plurality of mixing chambers, and also prevents axial kneading of the materials to be mixed.

The object of the invention is to provide a mixer of the above-mentioned type, in which the bearings are significantly shorter and simpler, so that the mixer side walls are significantly thinner, and in which case no forced synchronization between the mixing vanes is required. It is to be. In this case, the mixer not only does not inhibit the axial kneading of the substances to be mixed, but also precisely promotes this kneading.

This problem is solved by the features of claim 1 of the patent claims. Special configurations of the connecting strut according to the invention are described in claims 2-6.

The embodiments of claims 7 and 8 relate to a further embodiment of the mixing mechanism according to the invention, in which the mixing mechanism is also used in a mixing vessel assembled from two mixing drum halves.

The present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, a drum-shaped mixing container 2 is installed horizontally in a machine stand. In front of the end side 3.4 of this mixing vessel 2, rotating carrier arms 5.6 are arranged at one angle with respect to the other.
They extend in the radial direction and are offset by 80°. These carrying arms 5.6 are helically curved mixing vanes 7.8
The mixing vanes extend beyond the center into the mixing vessel 2 at an angle of attack of approximately 30°. The mixing vanes 7.8 are rigidly connected to one another at their opposite ends in the central part of the mixing vessel 2 via connecting struts 10. This connecting column 10 is additionally equipped with vanes or similar mixing elements 11 to improve the mixing process.

The mixing vanes 7.8 are commonly driven by a motor 12 which is connected to a chain 14 and a chain wheel 15.
and drives the carrier arm 5 via the bearing 16 and moves the second mixing vane 8 via the mixing vane 7 and the connecting strut 10.

As shown in FIGS. 1 and 2, the connecting strut 10 has a convex curved cross section, and its central plane is at a predetermined angle of attack α with respect to the axis of the mixing vessel 2. 8 between the free ends thereof.

This inclined arrangement of the connecting struts 1O ensures that, on their upper side, the flow behavior (references X, Y reference) and flow gradients are achieved. Accordingly, kneading of the substances to be mixed in the axial direction is conveniently performed.

In FIGS. 1 and 2, a lenticular connecting column 10 is shown. In other embodiments according to the basic concept, the connecting column 10 can also be designed, for example, as an elliptical or helical screw.

FIG. 3 shows a drum-shaped and horizontally placed mixing vessel assembled from two drum halves 2.2°;
Two pairs of mixing vanes 7.8 are mounted horizontally in this mixing vessel, parallel to one another.

These mixing vanes 7.8 consist of strip screws twisted in opposite directions with the same slope, each of these strip screws in pairs against the end-side remixing vessel wall 3.4.
The drum halves emerge diagonally from each other by 2.2° from the mixing vessel wall on the respective opposite end sides beyond their central part in the longitudinal direction to form an inversion for the substances to be mixed. extending over an interval.

The mixing vane 7.8 is connected to the carrier arm 5.6 in the region of the end-side mixing vessel wall 3.4.

Mixing vanes 7.8 are rigidly connected to one another via connecting struts 10 at opposite ends in the center of the drum half 2.2'. The band screws forming these mixing vanes 7.8 each extend approximately two-thirds of the length of the drum half 2.2'' with slopes pointing in opposite directions.

Drive axes X, Y for the mixing vane pairs are parallel to each other in the integral mixing vessel, which consists of drum halves 2.2'' joined together.

Each of these mixing vanes is itself moved in rotation via a carrier arm 5.6 in the manner described in connection with FIG.

The distance between the drive axes X and Y is maintained such that the movement trajectories of the band screws overlap. The mixing vane pairs are driven in opposite directions 1. in the directions of arrows 41 and 42.
In addition, the band screws are forced in such a way that the mixing vanes 7.8 dig into one another. This drive is synchronized.

A discharge opening 43 is provided at the bottom of the drum half 2.2'' in the center between the pair of mixing vanes.

When the mixer is activated, the strip scree knee scrapes the mixed material from the walls of the mixing vessel and transfers this mixed material in a radial direction of rotational movement and parallel to the drive axes I, H from one side wall to the other. The substances to be mixed are also fed diagonally or laterally through the mixing container.

That is, the merging streams meet with a large number of synchronous, on the one hand, and opposing flow component forces on the other hand, and these flow component forces result in extremely rapid and intense kneading of the components of the different materials to be mixed, and with this, a shortening of the mixing time. makes it possible to achieve a good mixing effect even if the length is short.

[Brief explanation of drawings]

1 is a sectional view of the mixing mechanism according to the invention in its normal state; FIG. 2 is a view of the mixing mechanism according to FIG. Mixing mechanism according to the invention, comprising a mixing vessel. The symbols in the figure are: 2.2°...Drum half part, 3.4...End face side of mixing container, 5.6...Carrying arm, 7.3...Mixing blade, 10... Connecting strut, 11...Mixing tool, 14
...Chain, 15...Chain wheel, 16.
...Bearing, 43...Discharge opening. , Agent: Mitsuyoshi Ezaki′ Agent: Senshi Ezaki

Claims (1)

[Scope of Claims] 1. A cylindrical mixing vessel and a radially rotating, 180
They are provided with mixing blades which are arranged offset from each other by an angle of 1°, project into the center of the mixing vessel and are helically curved, and which are rigidly connected to each other at their free ends. In a device for mixing building materials, in the connected mode, the connecting strut (10), in which the elements connecting the mixing vanes (7, 8) assist the mixing process.
An apparatus for mixing the above-mentioned building materials, characterized in that it is formed by: 2. Device according to claim 1, characterized in that the cross section of the connecting strut (10) has an oval shape. 3. Device according to claim 1, characterized in that the cross section of the connecting strut (10) has the shape of a convex curve. 4. The connecting strut (10) is mounted obliquely (with an angle of attack α) relative to the axis of the mixing drum (2);
A device according to claim 1. 5. Device according to one of claims 1 to 4, characterized in that the connecting strut (10) is twisted helically between the mixing vanes (7, 8). 6. Device according to one of claims 1 to 5, characterized in that a further mixing element (11) is fixed to the connecting column (10). 7. Two pairs of mixing vanes (7,
8), two mutually joined drum halves (
2, 2') and is used in a forced mixer for a concrete mixer with a mixing vessel placed horizontally, according to any one of claims 1 to 6. Device. 8. The double outer diameter of the drum halves (2, 2') in which the double outer diameters of the pairs of mixing vanes (7, 8) belonging to the drum halves (2, 2') are joined to each other. 8. The device of claim 7, wherein the device is larger than the radius.